Vacuum-pump



B. R. VAN VALKENBURG.

VACUUM PUMP. APPLICATION FILED saw. 19, 1918.

1,350,396. Patented Aug. 24,1920.

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B. R. VAN VA'LKENBURG.

VACUUM PUMP,

APPLICATION may) szPIjw, 191s.

Patented Aug. 24, 1920.

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4 SHEETS-SHEET 3- B. R. VANVALKENBURG.

VACUUM PUMP.

APPLICATION FIILED SEPT. w, 2918.

1,350,396. Patented Aug. 24, 1920.

4 SHEETS-SHE 4.

nwum Burt R. Van Valken burg w k Q S UNITED STATES PATENT OFFICE.

BURT R. VAN VALKENBURG, OF

OAKLAND, CALIFORNIA. ASSIGNOB. TO LMBFICLN PHOTO PLAYED COMPANY, OF, BERKELEY, GALIFOR-NIA, A CORPORATION OF CALI- FOBNIA.

Specification of Letters Patent.

Patented Aug. 24, 1929.

Application filed September 19, 1918. Serial No. 254,828.

residing at Oakland. in-the county of Ala-- meda and State of California, have invented certain new and useful Improvements in Vacuum-Pumps, of which the following is a specification.

The object of my invention is to provide a double acting, compressed air-operated vacuum pump which will take little care to maintain it and still perform its function efficiently. This pump is particularly adapted to be operated by the compressed air pump of a combined automatic organ and piano, to provide vacuum to operate the piano.

Referring to the drawings:

Figure 1 is a front view of my pump connected to the compressed air pump and pneumatic piano of a combined automatic organ and piano.

Fig. 2 is an enlarged rear view of my pump.

Fig. 3 is a cross section of my pump taken on line 3-3 of Fig. 2.

Fig. 4 is a fragmentary sectional view taken on line 44 of Fig. 30f the intake and exhaust vacuum valves of the pump.

Fig. 5 is a horizontal section of the pump taken on line 5-5 of Fig. 2.

Fig. 6: is a front view of one of the air intake and exhaust valves of the pump.

Fig. 7 is a front view of said air intake and exhaust valve with its front plate re-,

Fig. 8 is a sectional view ofv said air intake and exhaust valve taken on line 8-8 Of F 6; I

Fig. 9 is a sectional view of sald 'alr 1ntake and exhaust valve taken on line 9-9 of Fig. 6.

Fig. 10 is a front v1ew of the pump timer.

Fig. 11 is a front view of the pump tlmer with its front plate removed.

Fig. 12 is a rear view of the dpump timer.

In the drawings, 1 and 2 in icate a pair of air chambers spaced apart and secured at their corners to angle bars 3. At one end of said chambersare secured air intake and exhaust valves 4 and 5. A manifold 6 is secured to and communicates with said valves. The manifold has an air inlet 7.. The valves 4 and '5 include a chamber 8,

having a detachable front wall 9 secured to its side walls by screws 10, a pneumatic 11 arranged in said chamber, a port 12 leadlng from said chamber to the atmosphere, a port 13 leading from said port 12to a port 14 in the end wall of chambers 1 or.

2, and valve members 15 and 16 connected at the center by rod 17 secured to the movable member of pneumatic 11 and extending through port 12. The valve members 15and 16 are connected near their ends by rods 18 which extend through the port 12. The plate 9 is provided with a port 19 with which the manifold communicates. An air inlet 20 leads into pneumatic 11.

The inner walls of the air chambers 1 and 2. are provided with openings 21 and vacuum manifolds 22 and 23 extend across said openings and are secured to said inner walls, which manifolds are connected by a tube 24. Pistons 25 and 26 are arranged in the chambers 1 and .2 respectively, parallel to the inner walls thereof. The edges of said pistons are connected to oneend of flexible side walls 27, the, other end of'which walls are connected to the inner corners of the chambers 1 and 2. A bellows 28 is ar ranged centrally of the piston 25, the flexible walls of which are connected to the piston 25 and the manifold 22 respectively. A bellows 29 is arranged centrally of the piston 26, the flexible walls of which are connected to the piston 26 and the manifold 23. Ports 30 lead from the manifolds 22 and 23 into the bellows 28 and 29 and are controlled by flap valves 31. Ports lead from the bellows 28 and 29 through said manifolds to the atmosphere and are controlled by flap valves 33. The pistons 25 and 26 "are provided with openings 34 lead-' ing into the bellows 28 and 29 which openings are covered by plates 35 screwe to the pistons. The plates maybe'readil removed to permit access to the bel ows. Rods 36 extend throughthe o nings 21 in the inner walls of the air 0 ambers and connect the pistons 25 and 26 so that they reciprocate t ether.

' A timer 40 1s provided for timing the operation of the air valves 4 and 5 in s??- chronism with the pistons 25 and 26. v e timer includes an air chamber 41 mounted on the inner wall of the chamber 2. The chamber 41 has an inlet 42. Ports 43 and 44 extend through the upper wall of the chamber 41 and communicate with outlet ports 45 and 46 respectively also located'in said wall. Tubes 47 and'48 connect the' outlet ports 45 and 46 to the valves 4 and 5 re spectively. Valves 49 and 50 control the ports 43 and 44 respectively. Said valves each includes a pair of valve members 51 and 52 secured to a rod 53 extending through ports 43 and 44. Valves 49 and 50 are respectively controlled by pneumatics 54 and 55 arranged within the chamber 41, the movable membersof which are connected to the inner ends of rods 53. A tube 56 connects pneumatic 54 and port 46. A tube 57 connects pneumatic 55 and port 45. 011 blocks 58 and 59 secured to the top of the chamber 41, are secured spring fingers 60 and 61, the forward ends of which engage heads 62 and 63 on the outer end of rods 53. On a block 64 mounted on top of the chamber 41 is pivoted a valve operating lever 65, one end of which is adapted to engage head 62 and the other end is adapted to engage head 63. The lever65 has an arm 66 connected to one end of a spring 67, the otherend of which spring is connected to a pin 68.0n top of chamber '41, the spring being arranged to swing with the arm 66 across the pivot of lever 65 to swing the ends of the lever alternately against the'head 62 and 63 to operate valves 49 and 50 to close the ports 43 and 44 to the atmosphere alternately. Pins 69 and 70 extend from a rod 36 for engaging arm 66 to operate lever 65.

A vacuum tube 71 connects tube 24 and a pneumatic equalizer 72. An organ air compression pump 75 is shown in Fig. 1 and to its outlet tube 76 is connected a tube 77 which leads into manifold 6, and connects with tube 78 leading to inlet 42 of timer chamber 41.. A pneumatic piano 80 of a combined automatic organ and piano is shown. in Fig. 1. A tube '81 connects the equalizer to the pneumatic action of piano 80. t

' Assuming the parts to be in the position shown in Figs. 2, 3, 10, 11 and 12, the op eration of my pump is as follows: 7 p

, The pin 69 having engaged arm 66, one end of lever 65 is held against head 62 by spring 67 whereby valve members 51 and- 52,'respectively, of valve 49 close the outer end of port 43 and open the inner end of said port. The spring 61 holds the'valve 50 in the position shown in Fig. 11, themember 52 closing the inner end of port 46 and member 51 opening the outer end of said port. Air is pumped by organ pump 75 through tube. 77 into manifold 6 and through tube 78 and inlet 42 into timer chamber 41; through ports 43 and 45 and tube 47 into pneumatic 11 of' valve 4 and through, tube 57qinto pneumatic 55; Pneib matic 55 applies its action: in addition. to spring 61to hold. the valveefiQinthe position.

shown in Fig. 11. Pneumatic 11 of valve 4 forces valve member 15 into closed position and valve member 16 into open position. Air passes from manifold 6 into valve4 but is prevented by member 15 from passing through ports 12, 13 and 14 into chamber 1.

vThe closing of the inner end of port 44 by spring 61 and pneumatic 55 prevents compressed air from passing from chamber 41 through ports 44 and 46, and tube 48 into pneumatic 11 of valve 5. Air from manifold 6 enters chamber 8 of valve 5 and col lapses pneumatic 11, the air in said pneumatic being forced out through tube 48, port 46 and port 44 into the atmosphere.

The collapsing of said pneumatic lifts valve members 15 and 16 of valve 5, and opens the. inner end of port 12 and closes the outer end of said port, whereuponcompressed air passes from valve chamber 8 through ports 12, 13 and 14 into chamber 2 between the piston 26 and wall 27 and the chamber wall and forces said piston and piston 25 upwardly in their respective chambers. The upward movement of piston 25 causes bellows 28to open valve 31 and to suck air into itself from the action of piano 80 through tube 81, equalizer 72, tubes 71, 24 and 22 and ports 30, while the upward movement of piston 26 causes bellows 29 to open its valve 33 and forcethe air in the bellows out through ports 32 into the atmosphere. The upward movement of piston 25 forces air from the chamber 1 out through its port 14 and ports 13 and 12 into the atmosphere.

lVhen the pistons 26 and 25 reach the end of their upward stroke the pin 7 0 engages arm66 and trips lever 65, causing the lever to release head 62 and engage head 63, whereupon spring 60 lifts valve 49,- and closes the inner end of port 43 and opens the outer end thereof, while the lever depresses valve 50'and closes the outer end of port 44 and opens the inner end of said port. Air is shut off from valve 5 by valve 49 and the pistons cease to move upwardly. Air passes from chamber 41 through ports 44Jand- 46, and through tube 56 into pneumatic 54 which positively holds valve 49 lifted and closing the inner end and opening the outer end of port 43. Airpasses from chamber 41 through ports 44 and46, and tube 48 into pneumatic 11 of valve" 5, whereupon said pneumatic forces valve members 15 and 16 of said valve down until they close the upper endand open the lower end of port 12 of said valve. Air from manifold 6 enters valve 4 and collapses pneumatic 11 of said valve which lifts valve members 15 and 16 thereof and opens'the inner end and closes the outer end of the port 12 of said valve, the air in said pneumatic passing out through tube 47, port 45 and port 43 into thef atmospherep Air: under compression passes from the chamber 8 of valve 4 into chamber 1 between piston and its side walls 27 and the walls of the chamber 1 and forces said piston and piston 26 downwardly. The downward movement of the pistons causes bellows 29 to open its valve 31 and suck air into itself from the piano action through tube 81, equalizer 72, tubes 71 and 21, manifold 23 and ports 30, while the bellows 2S forces the air therein out through its ports 32 into the atmosphere. The downward movement of piston 26 forces air out of chamber 2 through its port 1-1, and ports 13 and 12 of valve 5 into the atmosphere. Between strokes of the pistons 25 and 26 the equalizer 72 automatically sucks air from the piano action through tube 81 and forces the air through tubes 71 and 24, manifolds 22 and 23 and ports into the bellows 28 and 29 from which it is ejected upon the compression stroke of the bellows, thus maintaining a continuous suction action through the pump and a continuous vacuum in the piano action. A com- 1 plete cycle of operations of the pump has been described which is repeated during further operation of the pump.

Having described my invention, I claim as new and desire to secure by Letters Patent:

1.11 pump including a pair of motor chambers, pistons in said chambers, flexible walls connected to the edge of said pistons and to a wall of the chambers, said chambers having inlets for admitting air between the pistons and flexible walls and the walls of the chamber, valves for controlling said inlets, means connecting said pistons, a bellows operated by each of said pistons, a manifold for each bellows provided with in lets leading into the bellows, valves for said inlets, means for allowing the air to escape from said bellows when compressed.

2. A pump including a pair of motor chambers, pistons in said chambers, flexible walls connected to the edge of said pistons and to a wall of the chambers, said chambers having inlets for admitting air between the piston and flexible walls and the Walls of the chamber, valves for controlling said inlets, means connecting said pistons, a bellows operated by each of said pistons, a manifold for each bellows provided with inlets leading into the bellows, valves for said inlets, means for allowing the air to esca e from said bellows when compressed, a tube communicating with both of said bellows, and means for timing said chamber valves.

3. A pump including a pair of motor chambers, pistons in said chambers, flexible walls connected to the edge of said pistons and to a wall of the chambers, said chambers having inlets for admitting air between the piston and flexible walls and the walls of the chamber, valves for controlling said inlets, means connecting said pistons, a bellows operated by each of said pistons, a manifold for each bellows provided with inlets leading into the bellows, valves for said inlets, means for allowing the air to escape from said bellows when compressed, and pneumatic means for timing said chamber valves.

In testimony whereof I affix my signature.

BURT R. VAN VALKENBURG. 

